body{
    font: 14px/1.6 SimHei;
}

.center {
    width: 1200px;
    margin: 0 auto;
}
.fl{
    float: left;
}
.fr{
    float: right;
}
ul{
    list-style: none;
}
.clearfix::after{
    content: "";
    display: block;
    height: 0;
    visibility: hidden;
    clear: both;
}
.rel{
    position: relative;
}
.abs{
    position: absolute;
}
.fix{
    position: fixed;
}
.on{
    background-color: #f60 !important;
    color: white !important;
}
